<template>
	<div :class="{ show: show }" class="header-search">
		<svg-icon class-name="search-icon" icon-class="search" @click.stop="click" />
		<el-select
			ref="headerSearchSelect"
			v-model="search"
			:remote-method="querySearch"
			filterable
			default-first-option
			remote
			placeholder="Search"
			class="header-search-select"
			@change="change"
		>
			<el-option v-for="option in options" :key="option.item.path" :value="option.item" :label="option.item.title.join(' > ')" />
		</el-select>
	</div>
</template>

<script>
// fuse is a lightweight fuzzy-search module
// make search results more in line with expectations
import Fuse from 'fuse.js/dist/fuse.min.js';
import path from 'path';

export default {
	name: 'HeaderSearch',
	data() {
		return {
			search: '',
			options: [],
			searchPool: [],
			show: false,
			fuse: undefined,
		};
	},
	computed: {
		routes() {
			return this.$store.getters.permission_routes;
		},
	},
	watch: {
		routes() {
			this.searchPool = this.generateRoutes(this.routes);
		},
		searchPool(list) {
			this.initFuse(list);
		},
		show(value) {
			if (value) {
				document.body.addEventListener('click', this.close);
			} else {
				document.body.removeEventListener('click', this.close);
			}
		},
	},
	mounted() {
		this.searchPool = this.generateRoutes(this.routes);
	},
	methods: {
		click() {
			this.show = !this.show;
			if (this.show) {
				this.$refs.headerSearchSelect && this.$refs.headerSearchSelect.focus();
			}
		},
		close() {
			this.$refs.headerSearchSelect && this.$refs.headerSearchSelect.blur();
			this.options = [];
			this.show = false;
		},
		change(val) {
			const path = val.path;
			const query = val.query;
			if (this.ishttp(val.path)) {
				// http(s):// 路径新窗口打开
				const pindex = path.indexOf('http');
				window.open(path.substr(pindex, path.length), '_blank');
			} else {
				if (query) {
					this.$router.push({ path: path, query: JSON.parse(query) });
				} else {
					this.$router.push(path);
				}
			}
			this.search = '';
			this.options = [];
			this.$nextTick(() => {
				this.show = false;
			});
		},
		initFuse(list) {
			this.fuse = new Fuse(list, {
				shouldSort: true,
				threshold: 0.4,
				location: 0,
				distance: 100,
				minMatchCharLength: 1,
				keys: [
					{
						name: 'title',
						weight: 0.7,
					},
					{
						name: 'path',
						weight: 0.3,
					},
				],
			});
		},
		// Filter out the routes that can be displayed in the sidebar
		// And generate the internationalized title
		generateRoutes(routes, basePath = '/', prefixTitle = []) {
			let res = [];

			for (const router of routes) {
				// skip hidden router
				if (router.hidden) {
					continue;
				}

				const data = {
					path: !this.ishttp(router.path) ? path.resolve(basePath, router.path) : router.path,
					title: [...prefixTitle],
				};

				if (router.meta && router.meta.title) {
					data.title = [...data.title, router.meta.title];

					if (router.redirect !== 'noRedirect') {
						// only push the routes with title
						// special case: need to exclude parent router without redirect
						res.push(data);
					}
				}

				if (router.query) {
					data.query = router.query;
				}

				// recursive child routes
				if (router.children) {
					const tempRoutes = this.generateRoutes(router.children, data.path, data.title);
					if (tempRoutes.length >= 1) {
						res = [...res, ...tempRoutes];
					}
				}
			}
			return res;
		},
		querySearch(query) {
			if (query !== '') {
				this.options = this.fuse.search(query);
			} else {
				this.options = [];
			}
		},
		ishttp(url) {
			return url.indexOf('http://') !== -1 || url.indexOf('https://') !== -1;
		},
	},
};
</script>

<style lang="scss" scoped>
.header-search {
	font-size: 0 !important;

	.search-icon {
		cursor: pointer;
		font-size: 18px;
		vertical-align: middle;
	}

	.header-search-select {
		font-size: 18px;
		transition: width 0.2s;
		width: 0;
		overflow: hidden;
		background: transparent;
		border-radius: 0;
		display: inline-block;
		vertical-align: middle;

		::v-deep .el-input__inner {
			border-radius: 0;
			border: 0;
			padding-left: 0;
			padding-right: 0;
			box-shadow: none !important;
			border-bottom: 1px solid #d9d9d9;
			vertical-align: middle;
		}
	}

	&.show {
		.header-search-select {
			width: 210px;
			margin-left: 10px;
		}
	}
}
</style>
